- Joined
- Mar 17, 2012
- Messages
- 4,280
- Location
- Australia
- Vessel Name
- Insequent
- Vessel Make
- Ocean Alexander 50 Mk I
I log each trip I make, and record distance and fuel consumption. For interest I've just made a histogram of the data.
The boat is an Ocean Alexander 50 Mk 1, and with typical fuel/water it has a displacement of around 28 tonnes. Power is a pair of Tier II John Deere 6068 TFM75, 201HP each. My normal cruise is 1600rpm, which makes approx. 8 kn with 20 litres per hour fuel consumption.
We have tidal currents which I will utilise if possible, but also wind against tide conditions that at times are unavoidable. At times I've cruised faster, but then realised that used more fuel than I needed to use! The logged data is from start-up to shut down, so includes warm-up, some slow speed zones as well as idle down periods before shut-down. If not in a hurry I might run at a little lower rpm.
This is what it looks like for 680 trips over a 10.5 year period, expressed as NMPG (US gallons). Its 18,600 nm and 2,500 engine hours.
The boat is an Ocean Alexander 50 Mk 1, and with typical fuel/water it has a displacement of around 28 tonnes. Power is a pair of Tier II John Deere 6068 TFM75, 201HP each. My normal cruise is 1600rpm, which makes approx. 8 kn with 20 litres per hour fuel consumption.
We have tidal currents which I will utilise if possible, but also wind against tide conditions that at times are unavoidable. At times I've cruised faster, but then realised that used more fuel than I needed to use! The logged data is from start-up to shut down, so includes warm-up, some slow speed zones as well as idle down periods before shut-down. If not in a hurry I might run at a little lower rpm.
This is what it looks like for 680 trips over a 10.5 year period, expressed as NMPG (US gallons). Its 18,600 nm and 2,500 engine hours.
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